package com.example.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.reggie.Dto.SetmealDto;
import com.example.reggie.common.CustomException;
import com.example.reggie.entity.Dish;
import com.example.reggie.entity.Setmeal;
import com.example.reggie.entity.SetmealDish;
import com.example.reggie.mapper.DishMapper;
import com.example.reggie.mapper.SetmealMapper;
import com.example.reggie.service.DishService;
import com.example.reggie.service.SetmealDishService;
import com.example.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

/**
 * 套餐信息表（Setmeal）
 */
@Service
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Autowired
    private SetmealDishService setmealDishService;

    //新增套餐,同时保存套餐和菜品的关联关系
    @Override
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息，操作setmeal，执行insert操作
        this.save(setmealDto);
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes.stream().map((item) -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());

        //保存套餐和菜品的关联信息，操作setmeal_dish，执行insert操作
        setmealDishService.saveBatch(setmealDishes);


    }

    @Transactional
    //删除套餐，删除关联菜品
    @Override
    public void removeWithDish(List<Long> ids) {
        //查询套餐状态，确认是否可以删除
        LambdaQueryWrapper<Setmeal> wrapper = new LambdaQueryWrapper<>();
        wrapper.in(Setmeal::getId,ids);
        wrapper.eq(Setmeal::getStatus,1);
        int count = this.count(wrapper);
        if (count>0){
            //如果不能删除，抛出一个异常
            throw new CustomException("套餐正在售卖，请先下架");
        }
        //如果可以删除，先删除套餐中的数据
        this.removeByIds(ids);
        //删除关系表中的数据
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(SetmealDish::getSetmealId,ids);
        setmealDishService.remove(queryWrapper);

    }
}

